Yanmar 4LHA-HTP Operation Manual page 454

Chapter 3 Fuel Injection Eguipment
4. Adjustment of Fuel Injection Pump and Governor
Rack indicator
Part number
(5) Check the control rack stroke
Make sure the rack position
the indicator scale when
lever is set at the maximum
If it is not at this value, change the link connect-
ing the governor and control
NOTE: Links are available
increments.
(6) Remove the plug in the oil filler port of the gover-
nor case, and fill the pump with about 400 c m
pump oill or engine o i l .
Plug
14
(Stroke)
121978-51500
is at 14±0.5 mm on
the governor control
operating position.
rack.
in 1 mm (0.0394 in.)
of
3
3-2-32
(7) Complete fuel oil piping and operate the p u m p
tester to purge the line of air.
(8) Set the oil feed pressure from the pump tester to
the injection pump at the pressure specified in the
separate service data sheet.
4-2 Adjustment of pre-stroke
(1) Remove the delivery valve holder of N o . l cylinder.
Remove the delivery valve spring, delivery valve
and gasket.
(2) Screw the pre-stroke measuring device in the screw
hole on the top of pump.
(3) Set the control rack to the full throttle position,
find the bottom dead center of the plunger while
rotating the pump by hand, and set the dial in-
dicator to zero.
Pre-stroke measuring device
4LHA Series